Water Pump

When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

4.3L, 5.0L, 5.7L and 7.4L Engines

See Figures 1 through 8

Fig. Fig. 1: Disconnect the lower radiator hose from the water pump inlet

Fig. Fig. 2: Remove the water pump attaching bolts

Disconnect the negative battery cable.

Drain the radiator. Remove the fan shroud.

Remove the drive belt(s).

Remove the alternator and other accessories, if necessary.

Remove the fan, fan clutch and pulley.

Remove any accessory brackets that might interfere with water pump removal.

Disconnect the lower radiator hose from the water pump inlet and the heater hose from the nipple on the pump. On the 7.4L engine, remove the bypass hose.

Remove the bolts, then pull the water pump assembly away from the timing cover.

To install:

Clean all old gasket material from the timing chain cover.

Install the pump assembly with a new gasket. Tighten the bolts to 30 ft. lbs. (41 Nm).

Connect the hose between the water pump inlet and the nipple on the pump. Connect the heater hose and the bypass hose (7.4L only).

Install the fan, fan clutch and pulley.

Install and adjust the alternator and other accessories, if necessary.

Install the drive belt (s). Install the upper radiator shroud

Fill the cooling system. Connect the battery.

Fig. Fig. 3: Remove the water pump from the vehicle

Fig. Fig. 4: Using a scraper, clean the old gasket from both mating surfaces of the water pump:

Fig. Fig. 5: Water pump installation - 4.3L engine

Fig. Fig. 6: Water pump installation - 5.0L and 5.7L engines

Fig. Fig. 7: Water pump installation - 7.4L engines

6.2L and 6.5L Diesel Engines

See Figure 4

Fig. Fig. 8: Water pump installation - 6.2L and 6.5L diesel engines

Disconnect the batteries, negative cable first.

Remove the fan and fan shroud.

Drain the radiator.

If the vehicle is equipped with air conditioning, remove the air conditioning hose bracket nuts.